Question: Tell me when  Mark Burnett, executive producer started for the Apprentice?
Paraphrase: At what time did Mark Burnett start as executive producer for the Apprentice?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q863122 p:P1431 ?s . ?s ps:P1431 wd:Q3294019 . ?s pq:P580 ?value}